<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		 <!-- div>(sub+sub+sup) -->
		<div>
			x<sub>1</sub>
			+x<sub>2</sub>
			=y<sup>2</sup>
		</div>
		<hr>
		<!-- HTML 4.01  行内元素-->
		<b>111</b>
		<i>111</i>
		<u>111</u>
		<s>111</s><br>
		<!-- html 5 -->
		<strong>111</strong>
		<em>111</em>
		<ins>111</ins>
		<del>111</del><hr >
		
		<pre>
		       @-.
		     _  )\\  _  
		    / \/ | \/ \
		   @/`|/\/\/|`\@
		      /~~~~~\
		     |  ^ ^  |
		     |   .   |
		     | (\_/) |
		 .-""-\ \_/ /-""-.
		 / .-. \___/ .-. \
		@/` /.-.   .-.\ `\@
		   @`   \ /   `@
		         @
		</pre>
		
		换行标记是&lt;br&gt;
		
	</body>
</html>
